SPN 1250 FMI 6ABS
ABS Modulator Valve - Front Right - Current Above Normal
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DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 1250 / FMI 6
Category
ABS
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: The front right ABS modulator valve is located in the ABS valve block assembly mounted on the vehicle frame near the front axle.
Common Symptoms
- ABS warning lamp illuminated
- Right front wheel ABS function disabled
- Reduced braking performance on right front wheel
- ECU records active fault for right front modulator valve
- Possible ABS system deactivation
Root Causes
- Shorted ABS modulator valve coil Damaged wiring harness or chafed wires between ECU and modulator valve Internal short circuit in ABS modulator valve assembly Moisture or corrosion causing short in valve connector
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Derate Behavior
Power Derate
No
System Interactions
SPN 1250 FMI 6 interacts with the following systems and may trigger cascading faults if not resolved promptly.
Common Diagnostic Mistakes
Replacing the sensor without verifying wiring continuity and supply voltage first.
Clearing codes without identifying and resolving the root cause — the fault will return.
Ignoring related active faults — cascading faults often share a root cause.
Skipping the connector inspection — corrosion and damaged pins are a leading cause of sensor faults.
Condemning the ECM before exhausting all wiring and component tests.
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OEM System Resources
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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 1250 FMI 6 — Full FSM Sequence & Repair Steps — includes wiring notes, sensor specs, and gated repair procedures.
Authority References
Diagnostic procedures on this page are informed by OEM service literature and industry standards.
Cummins QuickServe OnlineOfficial Cummins service manuals, fault code lookup, and TSB database.Detroit Diesel DiagnoCentralDetroit Diesel diagnostic procedures, DDDL documentation, and service literature.PACCAR MX Engine ServicePACCAR MX-11 and MX-13 engine service documentation and DAVIE diagnostic guides.Volvo/Mack Tech ToolVolvo and Mack engine fault code reference and PTT/Tech Tool diagnostic procedures.ASE — Diesel Truck Technician CertificationNational Institute for Automotive Service Excellence — T2 Diesel Engines certification standards.EPA Aftertreatment & Emissions GuidelinesU.S. EPA heavy-duty diesel aftertreatment compliance, DPF/SCR regulations, and NOx standards.
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